chore: upgrade to Angular 21

   - Update @angular/* packages to 21.0.8
   - Update @angular/cli and build tools to 21.0.5
   - Update ng-packagr to 21.0.1
   - Update angular-eslint to 21.1.0
   - Update README to reflect Angular 16-21 support

Author: CodeAndWeb

README.md

@@ -3,7 +3,7 @@
 The internationalization (i18n) library for Angular.
 <br/>
 
-## Angular 16 - 20
+## Angular 16 - 21
 
 The new [documentation](https://ngx-translate.org/) now covers installation on
 Angular 16+ and is divided into smaller, more readable sections, making it

package.json

@@ -16,25 +16,25 @@
     },
     "private": true,
     "dependencies": {
-        "@angular-devkit/build-angular": "^20.3.14",
-        "@angular/common": "20.3.12",
-        "@angular/compiler": "20.3.12",
-        "@angular/core": "20.3.12",
-        "@angular/forms": "20.3.12",
-        "@angular/platform-browser": "20.3.12",
-        "@angular/router": "20.3.12",
+        "@angular-devkit/build-angular": "^21.0.5",
+        "@angular/common": "21.0.8",
+        "@angular/compiler": "21.0.8",
+        "@angular/core": "21.0.8",
+        "@angular/forms": "21.0.8",
+        "@angular/platform-browser": "21.0.8",
+        "@angular/router": "21.0.8",
         "rxjs": "7.8.2",
         "tslib": "2.8.1",
         "zone.js": "0.15.1"
     },
     "devDependencies": {
-        "@angular/build": "20.3.10",
-        "@angular/cli": "20.3.10",
-        "@angular/compiler-cli": "20.3.12",
+        "@angular/build": "21.0.5",
+        "@angular/cli": "21.0.5",
+        "@angular/compiler-cli": "21.0.8",
         "@commitlint/cli": "20.1.0",
         "@commitlint/config-conventional": "20.0.0",
         "@types/jasmine": "5.1.13",
-        "angular-eslint": "^20.7.0",
+        "angular-eslint": "^21.1.0",
         "eslint": "9.39.1",
         "eslint-config-prettier": "10.1.8",
         "husky": "9.1.7",
@@ -46,7 +46,7 @@
         "karma-jasmine-html-reporter": "2.1.0",
         "karma-mocha-reporter": "2.2.5",
         "lint-staged": "16.2.6",
-        "ng-packagr": "20.3.2",
+        "ng-packagr": "21.0.1",
         "prettier": "3.6.2",
         "ts-mocks": "3.0.1",
         "typescript": "5.9.3",